Abrader



April 12, 1932. J LlNDRGTH 1,853,365

VABRADER Filed Jan. 18, 192? 5 Sheets-Sheet l April G. J. LINDROTH 3,

ABRADER Filed Jan. 18, 1927 3 Sheets-Sheet 2 April-12, 1932. J LINDRQTH 1,853,365

ABRADBR Filed Jan. 1a. 1927 3 Sheets- Sheet 5 Patented Apr. 12, 1932 warren stares GERALD J'. LINDROTH, OF TOLEDO, OHIO ABRADER Application filed January is, 1927. Serial No. 161,914.

This invention relates to rotary tools, especially for acting upon cylindrical surfaces.

This invention has utility when incorporated in finishing or refinishing tools, more particularly for the inner faces of cylinders as for internal combustion motors for motor vehicles.

Referring to the drawings:

Fig. 1 is a side elevation, with parts broken away, showing an embodiment of the invention as adapted for internal combustion motor cylinder work;

Fig. 2 is a plan view of the device of Flg. 1, with the drive disconnected and parts broken away;

Fig. 3 is a detail view of the driving connection between the operating motor and the tool Fig. 4 is a detail View on a reduced scale of the carrier frame, portions being shown 1n section;

Fig. 5 is a detail View, in perspective, of one of the sheet metal abrasive holding arms;

Fig. 6 is a side elevation of the tool frame and pivot rods with but one of the arms mounted and such swung outward and showing the cam;

Fig. 7 is a section on the line VIl-VII, Fig. 1, looking in the direction of the arrow;

Fig. 8 is a section on the line VIIIVIII, Fig. 7 looking in the direction of the arrow;

Fig. 9 is a view of the cam with its'com ponent parts separated Fig. 10 is a side elevation of an embodiment of the invention with terminal cams instead of intermediate cam as shown in Fig. 1;

Fig. 11 is a view on the line XI-XI, Fig. 10;

Fig. 12 is a section on the line X1IXII, Fig. 10;

Fig. 18 is a section on the line XIIL-XIII, Fig. 10;

Fig. 14 is a detail view of the cams; and

Fig. 15 is a partial section on the line XV-XV, Fig. 10. I

Electric motor 1 as held and directed may serve through its rotary driving shaft 2 having pocket terminal 3 and bayonet joint recess l to slip over head .5 of shaft 6 carrying pin 7 for thereby effecting clockwise rotation of the shaft 6. This shaft 6 withdisk 8 fixed therewith at its lower terminus comprises a portion of the framefor this abrading tool. Parallel with this terminal disk 8 is disk 9 having radial threaded opening 10 brought into register with recess 11 in the shaft v6 there to be anchored by set screw 12 and locking set screw 13. The disk 9 has openings 14 in alignment with internally threaded openings 15 in the disk 8 for receiving pivot rods 16 uniformly spaced from each other and eccentrically of the axis of the rotary frame 6, 8, 9.

Each of these rods 16 provides a mounting for an arm. Sheet metal structure for the arm is shown having an intermediate wrap or loop portion 17 providing a mounting bearing for the arm as embracing pivot rod 16. From this wrap 17 the pair of termini of the sheet metal arm extend. The shorter'of these termini extends as side 18 of pocket 19, while the longer of these termini provides base 20 for the pocket 19 with pocket side 21 opposing the pocket side 18. This pocket provides a gripping mounting for the working element of the finishing tool and in the instances of honing or abrading operations this may be considered as abrading element 22. The anchoring may be effective from the gripping action and spring of the sheet metal pocket, although in instances it may be more effectively secured or anchored as a unit by crimped portions 23 or provided with a supplemental anchoring, leading, or say pyroxylin cement 24. The finishing element 22 is accordingly disposed between the disks 8 and 9 and carried by the sheet metal arm having the wrap mounting bearing and the terminal pocket. This angular series of abrading elements 22 is disposed thus freely to swing outward to increase their radius of operation as to the working faces thereof.

Positive control means is herein provided for predetermining a minimum radius for operation and thus determining an active working of the tool for honing to a desired diameter and uniformity of a motor cvlinder. To this end, before assembling the frame disk 9 with the shaft 6 there is-mounted onto this shaft 6 cam sleeves 25, 26. This assembly is effected before the pin '7 has its drive fit assembly adjacent the head 5 of the shaft 6. The major sleeve 25 is provided with a pair of seats 27 into which tongues 28 from minor sleeve 26 may be given press assembly.

In practice, this cam sleeve 25 maybe of relatively soft metal or die cast, while the sleeve 26 may be of a harder material as steel. This provision of the harder sleeve portion 26 is desired for the reason that this sleeve 2'6 carries V-seats 29 with which-set screws 30, 31, may successively coact in effecting positive are shifting of the sleeve unit 25, 26, relatively to .the shaft 6 or the frame 6, 8, Q. This cam sleeve unit 25,- 26, as between the disks 8, 9, is provided with cam p'ortions32 disposed for thrusting action upon inner seat faces of the pocket bases 20 of the respective arms carrying the finishing elements 22. V

The r'otary tool as inserted into work and started to be drivenhas a tendency to swing the arms with the elements 22 outward. The adjustment of the set screw 30 or 31, as fixing the respective cam faces 32 thus as ooacting simultaneously with each of the faces of the pockets 20, insures a simultaneous uniform holding of each of these pockets as to the minimum radius distance. There is thus a positive l'ijolding for work operation at su h ai'igular adjustment of the cams as to the franie. 1 w a K V a In the operation, the hum ornoiseof the tool is a guide to the operator for indicating the degree of effectiveness of the honing epera'tion and as to the working' adj'ustment action f r the moi. As the tool is quieted down, if there be desire to make additional finishing or cutting action, the tool may be stopped and readjustment determined'by a resetting of the set screw 30 or 31 for the desired increase'in radial holding by the respective earns 32. The set screws 30 and 31 are so disposed that with the aligned or diametrical V ways29, one set screw 30 may take care of the earlier or shorter radius portionsfor cams 32 with the set screw 31 backed off or idle; while for still greater radius position of the arms as effected through the cams 32, the set screw 30 may be backed off to idle position and set screw 31 may have its taper terminus c'o'ac't with the extension or companion V-way 29. These adjusting means 30', 31, provide a range of positioning'for various arms which may be nicely determined simultaneously for each of'the arms with an efieetive holding of the arms in such minimum radial position throughout the working length of such arms. This holding is by a means angularly shiftable' as to the axis of a rotatingtool. t V

The motor shaft 2 instead of having cup terminus 3 may have ball terminus 33 with protruding pin ,34 to enter grooves 35 and move into offset terminals 36 thereof as a for arms 42 having pockets 43 in which are anchored finishingelements or abraders 44 by set s'or'e'w's 45. In the event the material or element 44 may be fragile, such may have armor pocket portion 46 so that the set screw may not tend to fracture such. These arms 42 on the sides thereof inward from the pockets 43have cam faces 47 with which coact cams 48 herein shown as terminally engaging the arms 42 upon opposite sides 'Of the medial bearing portions 49 forth'ese arms as guided by the rods 40, 41. These bearing portions 49 provide a frame member intermediate the cams 48. These cams 48 are connected by concentric stem 50 extending through bearing 51 of the intermediate frame member carrying the bearings 49. Fined with these cams 48 and steni50, and eccentric thereof, is stub projection 52 into attes s of the housing or frame member 37; The rods 41 are longer than the rods 40 to permit location of this chamber 58 as well as opening 54 to such chamber. In this opening 54 is set screw 55 directed for acting upon this projection 52 and thereby determining an angular shifting of the projection 52 as to the frame 37, 40, 41, 49; This adjustment or angular shifting moves the cams 48 along the faces 47 of the respective arms 42 in determining the minimum radius for operation of the honing element 44 as driven clockwise.

This" angular shifting into radial adjustment has the cam movements away from the pivot bearings for the arms as the operative radius is increased. The termini of the abrading elements 44 are simultaneously positively shifted radially and there is in this simplified construction a definite holding as to minimum radius operations identical for the several elements througheut the longitudinal or axial extent of such. v

What is claimed and it is desired to seenre by Letters Patent is:

1. A rotary tool comprising a main rotary frame, arms having axes parallel to the axis of the frame, said axes being laterally spaced from each other, said arms providing pockets, working face elements carried in the pockets, ad usting means angularly shiftahle as to the frame axis for limiting the angular swing of said arms and elements inward, and eccentric of the frame axis, and a set screw control rotatable to provide different positions for the adjusting means. a

Y 2. A rotary tool com rising amain rotary frame, ro ds having axes pa ralleltoth azii's 'f the frame, said rods being laterally spaced from each other, arms mounted by said rods and having free ends providing pockets, working face elements carried in the pockets by the arms, and radially and angularly shiftable adjusting means movable relatively to the frame and directly abutting the inner portion of the free end of the arms in limiting the angular swing of said arms and elements inward, said means providing a positive minimum diameter control for the tool.

3. A rotary tool comprising a main rotary frame, a plurality of pivot rods eccentric and axially parellel to said frame axis of rotation, an arm having mounting connection on each pivot rod, said arms each providing a pocket, a brading elements carried in the pockets by the arms, adjusting means concentric with the axis of rotation of said frame and having arm contacting faces angularly shiftable relatively to the frame for limiting the inward swing of said arms and elements in determining their working positions, said mounting connections and faces having one thereof intermediate the extent of the other along the rod, and a positive minimum diameter control for the adjusting means.

4. A rotary tool comprising a main rotary frame, a plurality of pivot rods uniformly spaced eccentric and axially parallel to said frame axis of rotation, an arm on each pivot rod having mounting connections and having an inwardly directed face, said arms each providing a pocket, working elements carried in the pockets by the arms, rotary adjusting means having cam faces for each arm face for thus determining arm spacing from the frame axis of rotation, said faces being intermediate the mounting connections of the respective arms, and a positive minimum diameter control for the adjusting means.

5. For a rotary tool having abearing, a tool carrier unit having a bearing eccentric to the tool bearing and axially parallel thereto, said unit comprising an arm folded upon itself to provide a pocket extending parallel to said bearings.

6. A rotary tool, and a tool element carrier arm folded upon itself to provide a bearing for the arm extending from the bearing to provide a pocket.

7 A rotary tool comprising a frame, pivot rods mounted in said frame, arms carried by said pivot rods, a cam angularly shiftable as to said frame, said cam including a major portion and a relatively harder minor portion, and frame carried adjusting means coacting with the harder portion for effecting angular shifting of the cam as to the frame in bringing about simultaneous adjustment of said arms.

8. A rotary tool comprising a frame, pivot rods eccentric and axially parallel to the axis of said frame, working elements, and arms wrapped about said rods and providing pockets mounting said elements.

elements carried by the arms, radially and angularly shiftable adjusting means movable relatively to the frame and limiting the angular swing of said arms and elements inward,

and positive minimumdiameter control for the adjusting means embodying rotary means carried by the frame andcoacting with the adjusting means for shifting said adjusting means as to the frame.

11. A rotary tool comprising a main rotary frame, arms pivoted eccentrically on and axially parallel to said frame, working face elements carried by the arms radially and angularly shiftable adjusting means movable relatively to the frame and limiting the angular swing of said arms and elements inward said adjusting means having a transversely extending way, and positive minimum diameter control for the adjusting means embodying rotary means carried by the frame for coacting with the adjusting means way for shifting said adjusting means as to the frame.

12. A rotary tool comprising a main rotary frame, arms pivoted eccentrically on said frame, working face elements carried by the arms, radially and angularly shiftable adjusting means movable relatively to the frame and limiting the angular swin of said arms and elements inward, said ad usting means having a transversely extending way, and set screw means carried by the frame for coacting with the adjusting means for shifting said means as to the frame.

In witness whereof I affix my signature.

GERALD J LIN DROTH. 

